Film capacitor and connection type capacitor, inverter, and electric-powered vehicle

• US 10,147,542 B2
• Filed: 03/03/2015
• Issued: 12/04/2018
• Est. Priority Date: 03/03/2014
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Maeda, Kazutaka, Kato, Wataru
• Primary Examiner(s): THOMAS, ERIC W
• Application Number:
  US15/121,060
• Publication Number:
  US 20160372264A1
• Time in Patent Office: 1,372 Days
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: H01G 4/005 Electrodes
• CPC Class Codes: H01G 4/04 Liquid dielectrics
• CPC Class Codes: H01G 4/18 of synthetic material, e.g. derivatives of cellulose H01G4/16 takes precedence
• CPC Class Codes: H01G 4/20 using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 H01G4/12 takes precedence
• CPC Class Codes: H01G 4/32 Wound capacitors
• CPC Class Codes: H01G 4/33 Thin- or thick-film capacitors thin- or thick-film circuits H01L27/00; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor H01L28/40
• CPC Class Codes: H01G 4/38 Multiple capacitors, i.e. structural combinations of fixed capacitors
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 7/5387 in a bridge configuration
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10S 903/907 Electricity storage, e.g. battery, capacitor

Abstract

There is a film capacitor capable of suppressing decrease in the electrostatic capacitance even after a self-healing phenomenon has occurred. A film capacitor includes a dielectric film; and an electrode film disposed on a principal surface of the dielectric film, the dielectric film containing an organic resin and an organic component having a higher volatility than the organic resin. The organic resin is preferably any one of a cyclic olefin-based resin, a polyarylate resin, a polyphenylene ether resin and a polyetherimide resin. The organic component is preferably at least one selected from the group consisting of cyclohexane, ethylcyclohexane, toluene, xylene, chloroform, and tetrahydrofuran.

Claims

1. A film capacitor, comprising:

a dielectric film; and

an electrode film disposed on a principal surface of the dielectric film,

the dielectric film containing an organic resin and an organic component having a higher volatility than the organic resin,

the organic resin being any one of a cyclic olefin-based resin, a polvarylate resin, a polyphenylene ether resin and a polyetherimide resin,

a content of the organic component contained in the dielectric film being equal to or greater than 1.2 mass % and equal to or less than 7.0 mass %.

2. The film capacitor according to claim 1, wherein

the organic resin is the cyclic olefin-based resin, and

the cyclic olefin-based resin is a ring-opening polymer or an addition copolymer.

3. The film capacitor according to claim 1, wherein

the organic resin is the cyclic olefin-based resin, and

the organic component is any one of cyclohexane, ethylcyclohexane, toluene, xylene, and a mixture of cyclohexane and toluene.

4. The film capacitor according to claim 1, wherein

the organic resin is the polvarylate resin, and

the organic component is any one of toluene, tetrahydrofuran, and n-methylpyrrolidone,

a content of the organic component contained in the dielectric film being equal to or less than 5.0 mass %.

5. The film capacitor according to claim 1, wherein

the organic resin is the polyphenylene ether resin or the polyetherimide resin, and

the organic component is chloroform,

a content of the organic component contained in the dielectric film being equal to or greater than 2.0 mass % and equal to or less than 5.0 mass %.

6. A connection type capacitor, comprising:

a plurality of the film capacitors according to claim 1; and

a bus bar connecting the plurality of the film capacitors.

7. An inverter, comprising:

a bridge circuit composed of switching elements; and

a capacitor part connected to the bridge circuit and composed of a film capacitor,

the film capacitor including

a dielectric film, and

an electrode film disposed on a principal surface of the dielectric film,

the dielectric film containing an organic resin and an organic component having a higher volatility than the organic resin,

the organic resin being any one of a cyclic olefin-based resin, a polvarylate resin, a polyphenylene ether resin and a polyetherimide resin,

a content of the organic component contained in the dielectric film being equal to or greater than 1.2 mass % and less than 7.0 mass %.

8. An electric-powered vehicle, comprising:

a power supply;

an inverter connected to the power supply, the inverter including

a bridge circuit composed of switching elements, and

a capacitor part connected to the bridge circuit and composed of a film capacitor,

the film capacitor including

a dielectric film, and

an electrode film disposed on a principal surface of the dielectric film,

the dielectric film containing an organic resin and an organic component having a higher volatility than the organic resin,

the organic resin being any one of a cyclic olefin-based resin, a polyarylate resin, a polyphenylene ether resin and a polyetherimide resin,

a content of the organic component contained in the dielectric film being equal to or greater than 1.2 mass % and less than 7.0 mass %;

a motor connected to the inverter; and

wheels driven by the motor.